libgstreamerd-3-dev 3.7.5-2build1 / usr / include / d / gtkd-3 / gstreamer / Segment.d

/*
 * This file is part of gtkD.
 *
 * gtkD is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version, with
 * some exceptions, please read the COPYING file.
 *
 * gtkD is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with gtkD; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
 */

// generated automatically - do not change
// find conversion definition on APILookup.txt
// implement new conversion functionalities on the wrap.utils pakage


module gstreamer.Segment;

private import glib.ConstructionException;
private import gobject.ObjectG;
private import gstreamer.c.functions;
public  import gstreamer.c.types;
public  import gstreamerc.gstreamertypes;
private import gtkd.Loader;


/**
 * This helper structure holds the relevant values for tracking the region of
 * interest in a media file, called a segment.
 * 
 * The structure can be used for two purposes:
 * 
 * * performing seeks (handling seek events)
 * * tracking playback regions (handling newsegment events)
 * 
 * The segment is usually configured by the application with a seek event which
 * is propagated upstream and eventually handled by an element that performs the seek.
 * 
 * The configured segment is then propagated back downstream with a newsegment event.
 * This information is then used to clip media to the segment boundaries.
 * 
 * A segment structure is initialized with gst_segment_init(), which takes a #GstFormat
 * that will be used as the format of the segment values. The segment will be configured
 * with a start value of 0 and a stop/duration of -1, which is undefined. The default
 * rate and applied_rate is 1.0.
 * 
 * The public duration field contains the duration of the segment. When using
 * the segment for seeking, the start and time members should normally be left
 * to their default 0 value. The stop position is left to -1 unless explicitly
 * configured to a different value after a seek event.
 * 
 * The current position in the segment should be set by changing the position
 * member in the structure.
 * 
 * For elements that perform seeks, the current segment should be updated with the
 * gst_segment_do_seek() and the values from the seek event. This method will update
 * all the segment fields. The position field will contain the new playback position.
 * If the start_type was different from GST_SEEK_TYPE_NONE, playback continues from
 * the position position, possibly with updated flags or rate.
 * 
 * For elements that want to use #GstSegment to track the playback region,
 * update the segment fields with the information from the newsegment event.
 * The gst_segment_clip() method can be used to check and clip
 * the media data to the segment boundaries.
 * 
 * For elements that want to synchronize to the pipeline clock, gst_segment_to_running_time()
 * can be used to convert a timestamp to a value that can be used to synchronize
 * to the clock. This function takes into account the base as well as
 * any rate or applied_rate conversions.
 * 
 * For elements that need to perform operations on media data in stream_time,
 * gst_segment_to_stream_time() can be used to convert a timestamp and the segment
 * info to stream time (which is always between 0 and the duration of the stream).
 */
public class Segment
{
	/** the main Gtk struct */
	protected GstSegment* gstSegment;
	protected bool ownedRef;

	/** Get the main Gtk struct */
	public GstSegment* getSegmentStruct(bool transferOwnership = false)
	{
		if (transferOwnership)
			ownedRef = false;
		return gstSegment;
	}

	/** the main Gtk struct as a void* */
	protected void* getStruct()
	{
		return cast(void*)gstSegment;
	}

	/**
	 * Sets our main struct and passes it to the parent class.
	 */
	public this (GstSegment* gstSegment, bool ownedRef = false)
	{
		this.gstSegment = gstSegment;
		this.ownedRef = ownedRef;
	}

	~this ()
	{
		if ( Linker.isLoaded(LIBRARY_GSTREAMER) && ownedRef )
			gst_segment_free(gstSegment);
	}


	/** */
	public static GType getType()
	{
		return gst_segment_get_type();
	}

	/**
	 * Allocate a new #GstSegment structure and initialize it using
	 * gst_segment_init().
	 *
	 * Free-function: gst_segment_free
	 *
	 * Returns: a new #GstSegment, free with gst_segment_free().
	 *
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this()
	{
		auto p = gst_segment_new();

		if(p is null)
		{
			throw new ConstructionException("null returned by new");
		}

		this(cast(GstSegment*) p);
	}

	/**
	 * Clip the given @start and @stop values to the segment boundaries given
	 * in @segment. @start and @stop are compared and clipped to @segment
	 * start and stop values.
	 *
	 * If the function returns %FALSE, @start and @stop are known to fall
	 * outside of @segment and @clip_start and @clip_stop are not updated.
	 *
	 * When the function returns %TRUE, @clip_start and @clip_stop will be
	 * updated. If @clip_start or @clip_stop are different from @start or @stop
	 * respectively, the region fell partially in the segment.
	 *
	 * Note that when @stop is -1, @clip_stop will be set to the end of the
	 * segment. Depending on the use case, this may or may not be what you want.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     start = the start position in the segment
	 *     stop = the stop position in the segment
	 *     clipStart = the clipped start position in the segment
	 *     clipStop = the clipped stop position in the segment
	 *
	 * Returns: %TRUE if the given @start and @stop times fall partially or
	 *     completely in @segment, %FALSE if the values are completely outside
	 *     of the segment.
	 */
	public bool clip(GstFormat format, ulong start, ulong stop, out ulong clipStart, out ulong clipStop)
	{
		return gst_segment_clip(gstSegment, format, start, stop, &clipStart, &clipStop) != 0;
	}

	/**
	 * Create a copy of given @segment.
	 *
	 * Free-function: gst_segment_free
	 *
	 * Returns: a new #GstSegment, free with gst_segment_free().
	 */
	public Segment copy()
	{
		auto p = gst_segment_copy(gstSegment);

		if(p is null)
		{
			return null;
		}

		return ObjectG.getDObject!(Segment)(cast(GstSegment*) p, true);
	}

	/**
	 * Copy the contents of @src into @dest.
	 *
	 * Params:
	 *     dest = a #GstSegment
	 */
	public void copyInto(Segment dest)
	{
		gst_segment_copy_into(gstSegment, (dest is null) ? null : dest.getSegmentStruct());
	}

	/**
	 * Update the segment structure with the field values of a seek event (see
	 * gst_event_new_seek()).
	 *
	 * After calling this method, the segment field position and time will
	 * contain the requested new position in the segment. The new requested
	 * position in the segment depends on @rate and @start_type and @stop_type.
	 *
	 * For positive @rate, the new position in the segment is the new @segment
	 * start field when it was updated with a @start_type different from
	 * #GST_SEEK_TYPE_NONE. If no update was performed on @segment start position
	 * (#GST_SEEK_TYPE_NONE), @start is ignored and @segment position is
	 * unmodified.
	 *
	 * For negative @rate, the new position in the segment is the new @segment
	 * stop field when it was updated with a @stop_type different from
	 * #GST_SEEK_TYPE_NONE. If no stop was previously configured in the segment, the
	 * duration of the segment will be used to update the stop position.
	 * If no update was performed on @segment stop position (#GST_SEEK_TYPE_NONE),
	 * @stop is ignored and @segment position is unmodified.
	 *
	 * The applied rate of the segment will be set to 1.0 by default.
	 * If the caller can apply a rate change, it should update @segment
	 * rate and applied_rate after calling this function.
	 *
	 * @update will be set to %TRUE if a seek should be performed to the segment
	 * position field. This field can be %FALSE if, for example, only the @rate
	 * has been changed but not the playback position.
	 *
	 * Params:
	 *     rate = the rate of the segment.
	 *     format = the format of the segment.
	 *     flags = the segment flags for the segment
	 *     startType = the seek method
	 *     start = the seek start value
	 *     stopType = the seek method
	 *     stop = the seek stop value
	 *     update = boolean holding whether position was updated.
	 *
	 * Returns: %TRUE if the seek could be performed.
	 */
	public bool doSeek(double rate, GstFormat format, GstSeekFlags flags, GstSeekType startType, ulong start, GstSeekType stopType, ulong stop, ref bool update)
	{
		int outupdate = (update ? 1 : 0);

		auto p = gst_segment_do_seek(gstSegment, rate, format, flags, startType, start, stopType, stop, &outupdate) != 0;

		update = (outupdate == 1);

		return p;
	}

	/**
	 * Free the allocated segment @segment.
	 */
	public void free()
	{
		gst_segment_free(gstSegment);
		ownedRef = false;
	}

	/**
	 * The start/position fields are set to 0 and the stop/duration
	 * fields are set to -1 (unknown). The default rate of 1.0 and no
	 * flags are set.
	 *
	 * Initialize @segment to its default values.
	 *
	 * Params:
	 *     format = the format of the segment.
	 */
	public void init(GstFormat format)
	{
		gst_segment_init(gstSegment, format);
	}

	/**
	 * Checks for two segments being equal. Equality here is defined
	 * as perfect equality, including floating point values.
	 *
	 * Params:
	 *     s1 = a #GstSegment structure.
	 *
	 * Returns: %TRUE if the segments are equal, %FALSE otherwise.
	 *
	 * Since: 1.6
	 */
	public bool isEqual(Segment s1)
	{
		return gst_segment_is_equal(gstSegment, (s1 is null) ? null : s1.getSegmentStruct()) != 0;
	}

	/**
	 * Adjust the values in @segment so that @offset is applied to all
	 * future running-time calculations.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     offset = the offset to apply in the segment
	 *
	 * Returns: %TRUE if the segment could be updated successfully. If %FALSE is
	 *     returned, @offset is not in @segment.
	 *
	 * Since: 1.2.3
	 */
	public bool offsetRunningTime(GstFormat format, long offset)
	{
		return gst_segment_offset_running_time(gstSegment, format, offset) != 0;
	}

	/**
	 * Convert @running_time into a position in the segment so that
	 * gst_segment_to_running_time() with that position returns @running_time.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     runningTime = the running_time in the segment
	 *
	 * Returns: the position in the segment for @running_time. This function returns
	 *     -1 when @running_time is -1 or when it is not inside @segment.
	 *
	 * Since: 1.8
	 */
	public ulong positionFromRunningTime(GstFormat format, ulong runningTime)
	{
		return gst_segment_position_from_running_time(gstSegment, format, runningTime);
	}

	/**
	 * Translate @running_time to the segment position using the currently configured
	 * segment. Compared to gst_segment_position_from_running_time() this function can
	 * return negative segment position.
	 *
	 * This function is typically used by elements that need to synchronize buffers
	 * against the clock or each other.
	 *
	 * @running_time can be any value and the result of this function for values
	 * outside of the segment is extrapolated.
	 *
	 * When 1 is returned, @running_time resulted in a positive position returned
	 * in @position.
	 *
	 * When this function returns -1, the returned @position should be negated
	 * to get the real negative segment position.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     runningTime = the running-time
	 *     position = the resulting position in the segment
	 *
	 * Returns: a 1 or -1 on success, 0 on failure.
	 *
	 * Since: 1.8
	 */
	public int positionFromRunningTimeFull(GstFormat format, ulong runningTime, out ulong position)
	{
		return gst_segment_position_from_running_time_full(gstSegment, format, runningTime, &position);
	}

	/**
	 * Convert @stream_time into a position in the segment so that
	 * gst_segment_to_stream_time() with that position returns @stream_time.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     streamTime = the stream_time in the segment
	 *
	 * Returns: the position in the segment for @stream_time. This function returns
	 *     -1 when @stream_time is -1 or when it is not inside @segment.
	 *
	 * Since: 1.8
	 */
	public ulong positionFromStreamTime(GstFormat format, ulong streamTime)
	{
		return gst_segment_position_from_stream_time(gstSegment, format, streamTime);
	}

	/**
	 * Translate @stream_time to the segment position using the currently configured
	 * segment. Compared to gst_segment_position_from_stream_time() this function can
	 * return negative segment position.
	 *
	 * This function is typically used by elements that need to synchronize buffers
	 * against the clock or each other.
	 *
	 * @stream_time can be any value and the result of this function for values outside
	 * of the segment is extrapolated.
	 *
	 * When 1 is returned, @stream_time resulted in a positive position returned
	 * in @position.
	 *
	 * When this function returns -1, the returned @position should be negated
	 * to get the real negative segment position.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     streamTime = the stream-time
	 *     position = the resulting position in the segment
	 *
	 * Returns: a 1 or -1 on success, 0 on failure.
	 *
	 * Since: 1.8
	 */
	public int positionFromStreamTimeFull(GstFormat format, ulong streamTime, out ulong position)
	{
		return gst_segment_position_from_stream_time_full(gstSegment, format, streamTime, &position);
	}

	/**
	 * Adjust the start/stop and base values of @segment such that the next valid
	 * buffer will be one with @running_time.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     runningTime = the running_time in the segment
	 *
	 * Returns: %TRUE if the segment could be updated successfully. If %FALSE is
	 *     returned, @running_time is -1 or not in @segment.
	 */
	public bool setRunningTime(GstFormat format, ulong runningTime)
	{
		return gst_segment_set_running_time(gstSegment, format, runningTime) != 0;
	}

	/**
	 * Convert @running_time into a position in the segment so that
	 * gst_segment_to_running_time() with that position returns @running_time.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     runningTime = the running_time in the segment
	 *
	 * Returns: the position in the segment for @running_time. This function returns
	 *     -1 when @running_time is -1 or when it is not inside @segment.
	 *
	 *     Deprecated. Use gst_segment_position_from_running_time() instead.
	 */
	public ulong toPosition(GstFormat format, ulong runningTime)
	{
		return gst_segment_to_position(gstSegment, format, runningTime);
	}

	/**
	 * Translate @position to the total running time using the currently configured
	 * segment. Position is a value between @segment start and stop time.
	 *
	 * This function is typically used by elements that need to synchronize to the
	 * global clock in a pipeline. The running time is a constantly increasing value
	 * starting from 0. When gst_segment_init() is called, this value will reset to
	 * 0.
	 *
	 * This function returns -1 if the position is outside of @segment start and stop.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     position = the position in the segment
	 *
	 * Returns: the position as the total running time or -1 when an invalid position
	 *     was given.
	 */
	public ulong toRunningTime(GstFormat format, ulong position)
	{
		return gst_segment_to_running_time(gstSegment, format, position);
	}

	/**
	 * Translate @position to the total running time using the currently configured
	 * segment. Compared to gst_segment_to_running_time() this function can return
	 * negative running-time.
	 *
	 * This function is typically used by elements that need to synchronize buffers
	 * against the clock or eachother.
	 *
	 * @position can be any value and the result of this function for values outside
	 * of the segment is extrapolated.
	 *
	 * When 1 is returned, @position resulted in a positive running-time returned
	 * in @running_time.
	 *
	 * When this function returns -1, the returned @running_time should be negated
	 * to get the real negative running time.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     position = the position in the segment
	 *     runningTime = result running-time
	 *
	 * Returns: a 1 or -1 on success, 0 on failure.
	 *
	 * Since: 1.6
	 */
	public int toRunningTimeFull(GstFormat format, ulong position, out ulong runningTime)
	{
		return gst_segment_to_running_time_full(gstSegment, format, position, &runningTime);
	}

	/**
	 * Translate @position to stream time using the currently configured
	 * segment. The @position value must be between @segment start and
	 * stop value.
	 *
	 * This function is typically used by elements that need to operate on
	 * the stream time of the buffers it receives, such as effect plugins.
	 * In those use cases, @position is typically the buffer timestamp or
	 * clock time that one wants to convert to the stream time.
	 * The stream time is always between 0 and the total duration of the
	 * media stream.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     position = the position in the segment
	 *
	 * Returns: the position in stream_time or -1 when an invalid position
	 *     was given.
	 *
	 * Since: 1.8
	 */
	public ulong toStreamTime(GstFormat format, ulong position)
	{
		return gst_segment_to_stream_time(gstSegment, format, position);
	}

	/**
	 * Translate @position to the total stream time using the currently configured
	 * segment. Compared to gst_segment_to_stream_time() this function can return
	 * negative stream-time.
	 *
	 * This function is typically used by elements that need to synchronize buffers
	 * against the clock or eachother.
	 *
	 * @position can be any value and the result of this function for values outside
	 * of the segment is extrapolated.
	 *
	 * When 1 is returned, @position resulted in a positive stream-time returned
	 * in @stream_time.
	 *
	 * When this function returns -1, the returned @stream_time should be negated
	 * to get the real negative stream time.
	 *
	 * Params:
	 *     format = the format of the segment.
	 *     position = the position in the segment
	 *     streamTime = result stream-time
	 *
	 * Returns: a 1 or -1 on success, 0 on failure.
	 *
	 * Since: 1.8
	 */
	public int toStreamTimeFull(GstFormat format, ulong position, out ulong streamTime)
	{
		return gst_segment_to_stream_time_full(gstSegment, format, position, &streamTime);
	}
}